Here's the deal ... RFK Jr. made these inflammatory remarks Sunday at the "Defeat the Mandates" rally in D.C., where he suggested Frank and the rest of the Jews fleeing/hiding for their lives during WWII actually had a stronger chance to dodge tyranny/death compared to people subjected to vaccine regulations in 2022.

Yes, seriously. He goes on to describe how American citizens are able to be tracked with ease with modern-day tech -- citing 5G, satellites and a lot of other kooky conspiracies. He says that while Frank and others could theoretically go undetected back in those days ... today's average Joe has no chance at eluding the government or its partners.

Wild stuff, we know -- especially coming from the son of the late Bobby Kennedy -- but RFK Jr.'s been on this far-right wing tip for a good long while now ... so no real surprises there.

What people do seem somewhat shocked by is the little-known fact that Robert's wife is actress Cheryl Hines, to whom he's been married since 2014. She has a big role on LD's HBO series "Curb Your Enthusiasm," where she plays his TV wife of the same name.

People started tweeting their disbelief that Larry could possibly work with someone who's involved with RFK Jr. on a deep level ... especially in light of today's comments, which many are calling anti-Semitic, or at the very least ... highly insensitive to the Jewish community.

Of course, Larry's a prominent and proud Jewish man ... and he's made his distaste for Republicans and Trumpers well-known over the years, especially through his show.